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1144534093
This change forks the execution of partial reduces in the coordinating node to the search thread pool. It also ensures that partial reduces are executed sequentially and asynchronously in order to limit the memory and cpu that a single search request can use but also to avoid blocking a network thread. If a partial reduce fails with an exception, the search request is cancelled and the reporting of the error is delayed to the start of the fetch phase (when the final reduce is performed). This ensures that we cleanup the in-flight search requests before returning an error to the user. Closes #53411 Relates #51857